The Preparation And Properties Of Fire Retardant Paraffin/polypropylene Form-stable Phase Change Material

Because of its high density of stored thermal energy and other merits like phase changeprocess at a constant or approximate constant temperature、easy to manipulate and so on, phasechange material(PCM) have an important role to solve the mismatch between supply anddemand of thermal energy and improve energy efficiency. The solid-liquid phase change materialwill leaked liquid in the course of work, to solve this problem, the traditional solution is to use acontainer to package them, while this solution would increase the cost greatly. In recent yearssome researchers use the method of form-stable phase change material to solve this problem. Asphase change materials are usually composed of organic materials, they are all easily toburn,because the construction and other fields have certain requirement for fire reststance of thematerials, in order to meet their application in construction field etc., we need to improve its fireretardant properties.In this paper, paraffin as phase change material and Polypropylene(PP) as support material,paraffin/Polypropylene form-stable phase change material were prepared. The purpose of theresearch is for the shortcoming of such form-stable phase change material in fire retardantproperties, with the halogen-free fire retardant halloysite(HNTs) and intumescent fireretardant(IFR) to research their fire retardant properties in this form-stable phase change material.In this paper, the melt blending method is adopted to prepare HNTs retardant form-stable phasechange material、HNTs and IFR synergistic fire retardant form-stable phase change material withthe help of twin screw extruder. By using SEM and DSC to study morphology and thermalstorage performance of the two fire retardant form-stable phase change materials respectively,their fire retardant properties were focused on by using the cone calorimeter(CONE), and the fireretardant mechanism was explored, too.Experimental results are as follows:1. The paraffin/Polypropylene form-stable phase change material with a variety content ofparaffin were prepared, the sealing performance tests indicate that when the paraffin content isnot high than70%, the liquid leaked phenomenon does not occur in the phase change process of form-stable phase change material. The paraffin content is fixed at70%, many kinds of HNTsretardant form-stable phase change material were prepared. The sealing performance test resultsshow that this fire retardant form-stable phase change material still have a good sealingperformance.2. By using DSC to research the thermal storage performance of fire retardant form-stablephase change material, the results show that the phase transition temperature of fire retardantform-stable phase change material are very close to paraffin’s, the latent heat is also littledifferent from the theoretical value, these all indicate that the fire retardant form-stable phasechange material have good thermal storage performance. This also shows that paraffin do notreact with other ingredients in the form-stable phase change material, there is only a simplephysical mixture between them.3. The fire retardant properties of HNTs retardant form-stable phase change material werestudied using cone calorimeter(CONE), the results indicate that the peak heat release rate(PHRR)of HNTs retardant form-stable phase change material continue to reduce with the increasingcontent of HNTs. When HNTs content is9%, the peak heat release rate(PHRR) of HNTsretardant form-stable phase change material is reduced by26.9%compared with the pureparaffin/Polypropylene form-stable phase change material. This indicates that halloysite have acertain fire retardant effect on form-stable phase change material.4. Many different proportions of HNTs and IFR synergistic fire retardant form-stable phasechange material were prepared, the fire retardant properties of synergistic fire retardantform-stable phase change material of various proportions, the synergistic fire retardant effectbetween halloysite and intumescent fire retardant was found through this study. When the totalcontent of the fire retardant is fixed at25%, a part intumescent fire retardant was replaced byhalloysite can effectively improve the fire retardant performance of synergistic fire retardantform-stable phase change material. When the content of halloysite is9%, compared to the pureintumescent fire retardant form-stable phase change material, the peak heat release rate(PHRR)、total heat release(THR)、SPR and CO2release rate of synergistic fire retardant form-stable phasechange material were all significantly decreased, this indicates that the synergistic fire effectbetween them is very significant.